Ratchet tube-cutter



UNITED STATES PATENT OFFICE.

ABEL CROVVFOOT, OF CHICAGO, ILLINOIS.

RATCH ET TUBE-CUTTER.

Specification forming part of Letters Patent No. 410,023, dated September 22, 1863; antedated March 11, 1862.

To all u'hom it may concern Be it known that I, ABEL CRoWFoo'r, of Chicago city, in the county of Cook and State of Illinois, have invented a new and useful Machine for the Purpose of Cutting out Tubes from Steam-Boilers; and I do hereby declare that the following is a clear and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in Which- Figure l is a perspective view. Fig. 2 is a longitudinal section. Fig. 3 is a transverse section. Fig. 4 is the cutting portion of the machine. Figs. 5 and 6 is that part ot' the machine which is used to govern or regulate the position of the cuttinginstrument.

A is an adjustable screw, the center of which rests against the fire-box or other sup port to hold the machine steady as a point of motion.

B is an extension-rod running into a cylinder in the body G, (shown by Fig. 2 and the dotted lines ot' Fig 1,) and is kept in any position by means of set screws and collars C D and E F, thus giving with the threaded end in A the required length, according to the space of the fire-box or other support, with much more facility than by the slow process of the screw alone, common to the ordinary ratchetdrill.

I and H are a collar and a set-screw to fasten the lever of the ratchet J.

M is the ratchet.

L is the spring of K, the dog, and N and O the bolt and nut to hold the dog and spring to the lever of the ratchet.

G is the main body of the machine.

Y is a cylindrical portion of the head Q, inserted into the body G and fastened by a pin P.

Q is the head of the machine, around which passes a collar, R, which collar is kept in its place by a set-screw, S, Fig. l, and through which collar passes a feed-screw, T, bearing upon a lever, IV, placed in a key-bed, which bed is shown by the dotted lines in the head Q, Fig. 2. Said lever has a dovetailed mortise in its outer end to receive one end of U, the cutting-instrument.

U, the cutting inztrument, plays in a mortise in the head Q, and is moved by the setscrew T, pressing upon the lever W, and thus giving the cutting-edge X the proper projec tion for workin g.

V is a part of the head Q cut out for the escape ofthe chips.

The head Q is jointed with the body G in order to be replaced by other heads to suit the size of different tubes.

The operation of my machine is as follows Set the collars R at such a distance from the cutting-instrument X as may be necessary in order to cut off the tube in the proper place; place the cutter X and head up to the collar 1t into the tube, then adjust the length of the machine by the extension-rod B so that the center A shall rest upon the re-box or other support, fastening the extension rod by the set-screws F and D, and placing the collar C against the body G. Having made a center punch-mark upon the front side of the tire-box on a line with the tube to be cut, place the center in it with exactness to steady the machine by turning the center A upon the screw end of the extension rod B. Now, by Working the ratchet by means ot' the handle J, giving the requisite projection ofthe cutting-edge X by turning the set screw T, the tube is cut oft'.

What I claim as m y invention, and desire to secure by Letters Patent, is

The combination, with a common ratchetdrill stock, of the cutter U, with either a square or angular-shaped cutting-edge, the lever W, feed-screw T, head Q, and extension-rod B, for the purpose of cutting off boileriiues in the manner set forth.

ABEL CROWFOOT.

Witnesses:

' HORACE S. POTTER,

W. S. EnsoN. 

